<?php
require_once("../includes/config.in.php");
require_once("../includes/function.in.php");
session_start();
class CaptchaSecurityImages {
    var $font;

    function generateCode($characters) {
        /* list all possible characters, similar looking characters and vowels have been removed */
        $possible = '1234567890zxcvbnmasdfghjkqwertyop';
        $code = '';
        $i = 0;
        while ($i < $characters) { 
            $code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
            $i++;
        }
        return $code;
    }

	function __construct($width='80', $height='40', $characters='4'){
            $this->font = dirname(dirname(__FILE__))."/capcha/font/angsab.ttf";
            $code = $this->generateCode($characters);
            
            /* font size will be 75% of the image height */
            $font_size = $height * 1.00;
            $image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
            /* set the colours */
            $background_color = imagecolorallocate($image, 255, 255, 255);
            $text_color = imagecolorallocate($image, 20, 40, 100);
            $noise_color = imagecolorallocate($image, 000, 255, 255);
            /* generate random dots in background */
            for( $i=0; $i<($width*$height)/3; $i++ ) {
                    imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
            }
            /* generate random lines in background */
            for( $i=0; $i<($width*$height)/150; $i++ ) {
                    imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
            }
            /* create textbox and add text */
            $textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
            $x = ($width - $textbox[2])/2;
            $y = ($height - $textbox[5])/2;
            imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
            /* output captcha image to browser */
            header('Content-Type: image/jpeg');
            imagejpeg($image);
            imagedestroy($image);
            $_SESSION['captcha_code'] = $code;
	}

}

$width = isset($_GET['width']) ? $_GET['width'] : '80';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '4';
new CaptchaSecurityImages($width, $height, $characters);